Freeman hanson



initentatr atrnt @fitte Letters Patent No. 64,665, dated lay 14, 1867.

i IMPaevBD TURN-TABLE.

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Be it knownthat I, FREEMAN IIANSON, of West Buxton,`in the county ofYork, and State of Maine, have invented a new andnimproved Method ofRaising the Centre of Turn-Tables; and I hereby declare the following tobe a full, clear, and exact description thereof, which will enableothersl to make and use my invention,lrefer ence being had to theaccompanying drawings, forming. part of this specification, in which-Figure 1 is a side elevation of `a portion of a turn-table showing myimprovement.

Figure 2, a betteln plan of the top or swinging port-ion of theturn-table, showing the movable plate and friction-rollers. .l

Figure 3, a top plan of the bottom or fixed part, showing the socket andtrack for the rollers.

Same letters shew like parts.

In an application heretofore made by me, upon which Letters Patent ofthe United States were issued August 28, 1866, I claimed a turn-table inan enclosed pit, te bemovcd bythe weight of the car or engine imposedthereon, the said pit having an inclined bottom. The present applicationis for Letters Patent upon certain improvements upon said invention.Experience has proved that some appliance is necessary, with thepatented invention above named, by which the centre, or parts'near thecentre, can be raised when,y desired, as in use the table will sink orsag at the centre, and its easy and ready revolution-which is verynecessary-will be, by the friction consequent upon such sinking, muchimpeded. My invention has also relation to a' method of supporting thecentre of .the revolving part of thetable. Without-the improvement I amabout to describe the swinging or upper part of the table must be oftenadjusted by levers, props, and screws, temporarily applied` thereto, andwith considerable labor and expense. My invention has for its object theobviation of these objec tions to the constructionand operation of thesubject-matter of my previous patent.

I willrst designate the different vportions of my improvementby letters,and then proceed to describe the uses and application of the same.

A showsa base which is intended to rest upon the inclined bottom ot' thecircular pit described in my previous application before referred to. Bis a portion of the revolving part or top of the table. No moreof this-lastmentioned part is shown inthe drawing than is necessary toillustrate my present improvement, but this part is of course intendedto extend the whole diameter of the pit, and has at its ends wheels uponwhich it runs, said wheels running on the inclined bottom of the'pit.This is fully set forth in ,my previous application and patent. Z) showsa plate attached to the upper side of A, and having a projection with ahollow end or socket, g. c shows a plate attached to theunder side of B,and having a projection, z, to fit into the hollow g. These two, L andg, form the centre upon which B revolves. Upon B I rigidly attach asecond plate, fm, dotted lines in iig. 1. The plate chas on its upperside four projections fitting into holes in the plate m, (seef, figs. 1and These projections are not connected with the upper plate m, but arearranged so as to slide in andout, as hereinafter described. Their oHiceis simply to keep the plate c in position under the plate m, and tocause the plate c to revolve with B. CZ shows friction-rollers runningon the circular track a, and they may be attached either to B near thecentre thereof, or tothe movable plate e. 7c shows four screws passingdown through 13, through the fixed plate lm,and bearing on the upperside of the movable or adjustable plate e. By turning these screwsinward or downward it is apparent that their ends pressing upon c willraise the partB from the adjustable plate c, the projectionsf remainingin the holes made for their reception in the platem and in Il. Thus thecentre of B, when, by reason of the great weight of engines, it has sunkor become depressed, can be readily and easily adjusted. The object ofthe friction-rollers (Z is to relieve the pressure and friction at thecentre, or on L and g.

I have specified e, I, and m as being plates, but I do not desire toconfine myself` to simple plates` of metal for this purpose, but to-anyequivalent form of construction to answer the purpose. Neither do Idesire to set forth that two friction-rollers wilt alone be employed,although I consider that number sufficient, inasmuch as the revolvingpart B is supported by the wheels at its two ends, which wheels run, asbefore described, on the' inclined bottom of-the pit, not shown in theaccompanying drawings, because patented before, and not herein claimed.The rollers herein specified and claimed are different from, andintended to be used at the same time with, but not for the same purposeas, the rollers described in my previous patent. The single object ofthe above-named and described devices is to prevent depression andconsequent friction at or neainthe centre of the e4,es5 '2 revolvingpart B. I do not claim the inclined turn-table previously patented, andthe principle ofthe invention covered by the said previous patent to me.The screws 7c een be operated and constructed in :my of the ordinary andwell-known forms. I do not claim providing a turn-table with n.ball-nnd-socket pivot, neither dovI claim the combination of n plate,standard, cross-piece, und ball, when employed asset forth in the patentof J. L. Kinsey, No. 51,192; neither do I claim :t cap, used inconnection or applied to the ball and socket pivot of a. turn-table. Myinvention has in view simply a, combination of devices for the easyelevation of those parte of my improved turn-tnble which lie nbeutthecentre thereof. V

What I do claim, and desire to secure by Letters Patent, is- '.lhearrangement of the plate c, having its projections f, its perth, undwheels d, plate b, and projection y, all ns :rnd for the purposesdescribed, when the said plate c is operated by means of the four screws7c, in thev inn-nner herein set forth. v

FREEMAN IIANSON.

Witnesses: WILLIAM Hnxnr Cmrronn, HENRY C. Hoesrox.

